What does the MIL light indicate?

[BraxtonFitz]

MIL stands for Malfunction-Indicator-Lamp, indicating a fault in the engine system. The MIL light illuminates due to excessive carbon deposits inside the engine, a malfunctioning oxygen sensor causing an imbalance in the air-fuel mixture, or poor fuel quality leading to incomplete combustion, among other issues that trigger the engine warning light. Below is an introduction to the malfunction indicator lamp: 1. The malfunction indicator lamp is located on the instrument panel, typically in red (refer to the vehicle's manual for specifics). 2. During the power-on self-test, the malfunction indicator lamp stays lit for 2 seconds before turning off. It lights up when a fault is detected in the fuel injection system: it remains steadily lit for general faults and flashes for severe faults. The lamp automatically turns off once the fault is resolved.